• Title/Summary/Keyword: Frequency-amplitude tracker

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Design of the Extended Kalman Filter for Frequency-amplitude Tracker (확장칼만필터 주파수-진폭 추적기 설계)

  • 윤종락;노용주;전재진
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.3
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    • pp.256-263
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    • 2002
  • In this study, the tracking of the temporal variation of the frequency and the amplitude in the presence of additive white Gaussian noise is considered using the Extended Kalman filter (EKF. The EKF has many applications and it has been applied to the problem of tracking the time-variable frequency. However the existing EKF frequency trackers could was driven in the small time-variable amplitude or required the additional amplitude tracker in the large time-variable amplitude. In this study, the EKF frequency-amplitude tracker, which could track both frequency and amplitude simultaneously from the measured signal in the relatively large time-variable amplitude environment, is proposed for improving the performance of the time-variable frequency tracking and its performance is verified by the simulation and the experimental work.

Amplitude Dependent Dynamic Properties of Tall Building under the Strong Wind (풍응답계측시 RD법에 의한 고층건물의 동적특성의 진폭의존성)

  • Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
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    • v.4 no.1 s.11
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    • pp.61-68
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    • 2004
  • The wind tracker and structural monitoring system recorded wind and dynamic response data. The measured building is located in the moutatin in Sokcho. The damping ratio and natural frequency were analysed in this paper to obtain amplitude dependence. Amplitude dependent damping was showed clearly in the increasing rate of 9%. The tendency of dynamic properties of building obtained here are useful for the validation of dynamic properties of buildings in the evaluation of serviceability.

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Study on Common Phase Offset Tracking Scheme for Single Carrier System with Frequency Domain Equalization (단일 반송파 주파수 영역 등화 시스템을 위한 공통 위상 추적 기법 연구)

  • Kim, Young-Je;Park, Jong-Hun;Cho, Jung-Il;Cho, Hyung-Weon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.11C
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    • pp.641-648
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    • 2011
  • Frequency domain equalization is the most promising technology that has relatively low complexity in multipath channel. A frame of single carrier system with frequency domain equalization (SC-FDE) has cyclic prefix to mitigate effect of delay spread. After synchronization and equalization procedure on the SC-FDE system, common phase offset (CPO) that can introduce performance degradation caused by phase mismatch between transmitter and receiver oscillators is remained. In this paper, common phase offset tracking in frequency domain is proposed. To track CPO, constant amplitude zero autocorrelation code sequence as training sequence is adopted. By using numerical results, performance of mean square error is evaluated. The results show that MSE of CPO has similar performance compare to the time-domain estimation and there is no need of domain conversion.

The Relative Position Estimate of the Moving Distributed Sources Using the Doppler Scanning Technique (도플러 스캐닝 기법을 이용한 이동하는 다중 음원의 상대 위치 추적 기법)

  • 노용주;윤종락;전재진
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.5
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    • pp.446-454
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    • 2002
  • This paper presents the Doppler Scanning technique which enables us to detect the relative positions of moving distributed sources using Doppler frequency shift estimate when the moving source consists of distributed sources with different signature frequencies. Doppler frequency shifts of characteristic frequencies of machinery noise sources such as ship's generator and propeller, with tine along CPA (Closest Point of Approach of moving source) are unique, and can be functioned with respect to each source position. Therefore, this technique can be applied to estimate the relative geometrical positions between machinery noise sources. The Extended Kalman Filter (EKF) which has a high frequency resolution with high time resolution, is adopted for improving accuracy of Doppler frequency shift estimate geometric resolution of machinery positions since machinery noise sources show in general low frequency band characteristics with limited spacial distance. The performance of the technique is examined by the numerical simulations and is verified by the experiment using loudspeaker sources on the roof of the car.